Tensile vs. Compressive Modulus % Difference
Tensile vs. Compressive Modulus % Difference
(OP)
What is the typical % difference between tensile/compressive modulus for the widely used carbon fiber material systems?
I've seen values ranging from 0 to 30% from literature and internal M&P test efforts. I understand it can be a difficult parameter to measure and want to understand what is typical.
Additionally, does it make sense to generate compressive modulus value using sandwich coupons if nearly all our practical structures are of sandwich construction?
Appreciate the feedback
Ryan
I've seen values ranging from 0 to 30% from literature and internal M&P test efforts. I understand it can be a difficult parameter to measure and want to understand what is typical.
Additionally, does it make sense to generate compressive modulus value using sandwich coupons if nearly all our practical structures are of sandwich construction?
Appreciate the feedback
Ryan
RE: Tensile vs. Compressive Modulus % Difference
Compression modulus is not difficult to measure, though generally requires use of strain gages due to short gage lengths required to prevent specimen buckling.
Are the facesheets of your sandwich panels precured or cocured? do the panels use honeycomb core? Both tension and compression moduli will be reduced for sandwich panel facesheets that are cocured over honeycomb core where the facesheet dimples into the cells.
RE: Tensile vs. Compressive Modulus % Difference
The sandwich panel facesheets would be cocured to either honeycomb or foam.
RE: Tensile vs. Compressive Modulus % Difference
Ask them for the load-strain plots for both tension and compression tests.
RE: Tensile vs. Compressive Modulus % Difference